Google Earth

Google Earth is a free virtual globe program linked to online resources, providing "layers" of location–specific information, such as high resolution satellite imagery, maps, and even three–dimensional terrain and buildings. The layers can be turned off or on to show roads, borders, parks, place names and much more. Users can save places or add and share their placemarks and related information with others. Other tools allow users to overlay images and measure position, elevation, or distance between points. Google Earth allows the user to print, save, and email images and views.